code: def vocab_size(self) -> int:
      return len(self._keras_tokenizer.word_index)
  
file_path: headliner/headliner/preprocessing/keras_tokenizer.py
imports: from typing import List, Iterable, Dict
  from keras_preprocessing.text import Tokenizer
  from headliner.preprocessing.tokenizer import Tokenizer
label_desc: Use image node_id 4 for calling the KerasTokenizer obj's underlying member method code with example usage: obj.vocab_size() and returns: len